diff options
| author | Alexander Lobakin <aleksander.lobakin@intel.com> | 2024-05-09 16:46:16 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2024-05-09 19:00:29 +0200 |
| commit | a6016aac5252da9d22a4dc0b98121b0acdf6d2f5 (patch) | |
| tree | 3c77ee2d2df0c886af162b6d85f6d562c3d6b1b7 /kernel/dma/swiotlb.c | |
| parent | 163943ac00cb31ac1a88ce5f78a7e2ead37329ec (diff) | |
dma: fix DMA sync for drivers not calling dma_set_mask*()
There are several reports that the DMA sync shortcut broke non-coherent
devices.
dev->dma_need_sync is false after the &device allocation and if a driver
didn't call dma_set_mask*(), it will still be false even if the device
is not DMA-coherent and thus needs synchronizing. Due to historical
reasons, there's still a lot of drivers not calling it.
Invert the boolean, so that the sync will be performed by default and
the shortcut will be enabled only when calling dma_set_mask*().
Reported-by: Steven Price <steven.price@arm.com>
Closes: https://lore.kernel.org/lkml/010686f5-3049-46a1-8230-7752a1b433ff@arm.com
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Closes: https://lore.kernel.org/lkml/46160534-5003-4809-a408-6b3a3f4921e9@samsung.com
Fixes: f406c8e4b770. ("dma: avoid redundant calls for sync operations")
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Steven Price <steven.price@arm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'kernel/dma/swiotlb.c')
| -rw-r--r-- | kernel/dma/swiotlb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index ae3e593eaadb..068134697cf1 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -1409,7 +1409,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr, } /* - * If dma_need_sync wasn't set, reset it on first SWIOTLB buffer + * If dma_skip_sync was set, reset it on first SWIOTLB buffer * mapping to always sync SWIOTLB buffers. */ dma_reset_need_sync(dev); |